Revert 99688 - Allow gpu features for about:blank (unlike other about: schemes)

TEST=run with --force-compositing-mode and --show-fps-counter, verify
that the counter shows up on about:blank and not on other about: pages
BUG=95107


Review URL: http://codereview.chromium.org/7779022

TBR=jamesr@chromium.org
Review URL: http://codereview.chromium.org/7782021

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@99875 0039d316-1c4b-4281-b951-d872f2087c98

content/browser/tab_contents/tab_contents.cc

@@ -1802,8 +1802,7 @@ WebPreferences TabContents::GetWebkitPrefs() {
   // chrome-devtools: pages (unless it's specifically allowed).
   if ((GetURL().SchemeIs(chrome::kChromeDevToolsScheme) ||
       GetURL().SchemeIs(chrome::kChromeUIScheme) ||
-      (GetURL().SchemeIs(chrome::kAboutScheme) &&
-       GetURL().spec() != chrome::kAboutBlankURL)) &&
+      GetURL().SchemeIs(chrome::kAboutScheme)) &&
       !web_prefs.allow_webui_compositing) {
     web_prefs.accelerated_compositing_enabled = false;
     web_prefs.accelerated_2d_canvas_enabled = false;